Miguel,
I'd also recommend Davis' One River. Although it's mostly about ethnobotany (as is Serpent and the Rainbow), there are some weapons related things in there as well. Curare, for instance (in One River), or zombie making (in Serpent and the Rainbow).
As for Carlos Castaneda, if you haven't read any of his books, I'd suggest checking out the Wikipedia articles first, just so you know what you're getting into.
Best,
F
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